Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net loss	$ (38,511)	$ (9,989)	$ (8,513)
Adjustments required to reconcile net loss to net cash used in operating activities:
Depreciation	56	49	56
Capital gain on sale of property and equipment		(10)	(43)
Loss on Fixed Asset Disposal	3
Cost of options issued to employees, directors and others as non-cash compensation	1,507	2,468	2,873
Amortization of debt discount related to convertible bonds	385	325	357
Change in derivative liability	(1,521)	971	(731)
Impairment of unproved oil and gas properties	30,906
Change in assets and liabilities, net:
Other deposits	260	(540)
Prepaid expenses and other	(27)	(87)	13
Governmental receivables	876	(1,175)	185
Other receivables	(20)	(51)	45
Severance pay, net		2	21
Accounts payable	75	15	(181)
Accrued liabilities	178	(38)	(411)
Asset retirement obligation			(4)
Net cash used in operating activities	(5,833)	(8,060)	(6,333)
Cash flows from investing activities
Acquisition of property and equipment	(19)	(65)	(26)
Proceeds from sale of property and equipment		14	44
Investment in unproved oil and gas properties	(15,931)	(10,820)	(1,192)
Net cash used in investing activities	(15,950)	(10,871)	(1,174)
Cash flows from financing activities
Proceeds from sale of 10% Senior Convertible Bonds			3,470
Payments related to capital lease	(9)	(22)
Deferred offering cost			(2)
Proceeds from exercise of stock options	19	551	16
Proceeds from Rights Offering	3,038
Proceeds from issuance of stock and exercise of warrants	13,781	22,994	4,338
Net cash provided by financing activities	16,829	23,523	7,822
Net (decrease), increase in cash, cash equivalents and restricted cash	(4,954)	4,592	315
Cash, cash equivalents and restricted cash - beginning of period	9,079	4,487	4,172
Cash, cash equivalents and restricted cash - end of period	4,125	9,079	4,487
Non-cash investing and financing activities:
Cost of options capitalized to oil & gas properties	348	256	213
Unpaid investments in oil and gas properties	2,946	3,876	25
Debt discount related to the derivative liability			1,626
Acquisition of property and equipment under capital lease		71
Convertible Bond interest paid in shares	331	346
Capitalized convertible bond interest attributed to oil and gas properties	331	346
Deferred offering cost			136
10% Senior Convertible Bonds converted to shares	$ 176	$ 149	$ 8